The starting bid is £240,000 ($370,000), with 13 days left — but is expected to go for considerably more than that. Christie's estimates the final price will be between £300,000 ($464,000) and £500,000 ($773,000). It's part of Christie's "Seven Centuries of Science" auction, which is "a curated group of scientific instruments that span the centuries from 1300-1976. These artefacts tell the story of the history of calculating and computing, beginning with from the newly discovered 'Chetwode' horary Quadrant from the 14th century through to the iconic Apple-1 that heralded the revolution in home computing."

Buyer beware, however: The machine hasn't actually been turned on since 2005. "Neither of the electrics nor electronics have been tested," Christie's warns. "We assume it could be brought up to working order again," but cautions: "We recommend a certified engineer attempt this."

As an added bonus, the device comes "with the extremely rare first manual issued by the Apple computer company." It was written by Ronald Wayne, who also designed Apple's original logo.